It comes from fenestra, latin for “window,” also as in dinosaurs & birds have an antorbital fenestrae—I
don’t know its that’s strictly true, a word I am getting slightly sick of, mostly because I can’t keep all the fenesrae straight.
Fri May 28 2004 21:14 PST Hee!:
According to m-w.com, “defenestration” is the favorite word of 2004. I remember learning about the denfenestraion of Prague; I can’t remember to whom or when it happened, but it was during the religious wars, and it helped me remember that fenętre is “window” in French.